期刊
SURFACE & COATINGS TECHNOLOGY
卷 140, 期 1, 页码 58-66出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0257-8972(01)01099-4
关键词
XANES; piezo-electrokinetic intermetallics; zeta potential; AFM; benzotriazole; hexavalent chromium; inhibition; aluminum alloys
Selection of alternatives to hexavalent chromium for inhibitors and inhibiting films for Al and its alloys requires a clear understanding of how hexavalent chromium inhibits corrosion. To this end, the following hypotheses have been proposed: residual chromate in conversion coatings provides self healing; hydrated Cr(III) oxide films are uniquely inert and hydrophobic; oxyanions of Cr(VI) rapidly passivate secondary phases in the highly unstable Cu-rich aluminum alloys; and adsorption of hexavalent chromium on passive aluminum oxide makes it less susceptible to chloride attack. Evidence supporting these hypotheses come from X-ray spectroscopic analysis (XANES) of conversion coatings on aluminum, characterization of Cr(VI) oxyanion adsorption on anodized aluminum via a piezo-electrokinetic (PEK) method, and the electrochemical current vs. voltage response model intermetallic compounds. (C) 2001 Published by Elsevier Science B.V. All rights reserved.
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